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Hazmat crews and a bomb squad could be seen at the home on Condor Lane, where federal authorities say illegal drugs and possible bomb-making chemicals were found.

"The number of police cars and units coming in are what has struck us as unusual," neighbor Scott Hurd said. "And shortly after, we were told to keep kids and everyone off the lower level of the street."

A 20-year-old man was found unresponsive in the house and was taken to a hospital. He was expected to be OK.

Residents of the home were forced to leave during the investigation.

"There were probably in excess of 12 different chemicals inside the home," Northern Regional Police Chief Bob Amann said. "Until all of the chemicals are removed from the home, they are not permitted back in the home until it is cleaned up by a professional agency."

No charges have been filed. Agents with the FBI and the federal Bureau of Alcohol, Tobacco, Firearms and Explosives are investigating, along with Allegheny County police.

Northern Regional Police said they have been called to the house seven times since 2005 for reports of underage drinking and disorderly conduct.

County property records list Theresa Gaugler as the owner of the house. Her Twitter page describes her as an actress and a spokesmodel.